package com.heima.wemedia.service.impl;

import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.common.constants.WemediaConstants;
import com.heima.common.exception.CustomException;
import com.heima.model.common.dtos.PageResponseResult;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.common.enums.WmNewsMessageConstants;
import com.heima.model.wemedia.dtos.WmNewsDto;
import com.heima.model.wemedia.dtos.WmNewsPageReqDto;
import com.heima.model.wemedia.pojos.*;
import com.heima.wemedia.mapper.WmMaterialMapper;
import com.heima.wemedia.mapper.WmNewsAndMaterialMapper;
import com.heima.wemedia.mapper.WmNewsMapper;
import com.heima.wemedia.service.WmNewsAutoScanService;
import com.heima.wemedia.service.WmNewsService;
import com.heima.wemedia.service.WmNewsTaskService;
import io.seata.spring.annotation.GlobalTransactional;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.*;
import java.util.stream.Collectors;

/**
 * @author shiminghui
 * @date 2024/11/1 18:04
 * @description: TODO
 */
@Service
public class WmNewsServiceImpl extends ServiceImpl<WmNewsMapper, WmNews> implements WmNewsService {
    @Autowired
    private WmNewsMapper wmNewsMapper;
    @Autowired
    private WmMaterialMapper wmMaterialMapper;
    @Autowired
    private WmNewsAndMaterialMapper wmNewsAndMaterialMapper;
    @Autowired
    private WmNewsAutoScanService wmNewsAutoScanService;
    @Autowired
    private WmNewsTaskService wmNewsTaskService;
    @Autowired
    private KafkaTemplate kafkaTemplate;

    /**
     * 查询文章列表
     *
     * @param dto
     * @param user
     * @return
     */
    @Override
//    @GlobalTransactional
    public ResponseResult findAll(WmNewsPageReqDto dto, WmUser user) {
        //参数检查
        if (dto == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        dto.checkParam();
        if (user == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN); // 未登录
        }

        //查询条件
        LambdaQueryWrapper<WmNews> queryWrapper = new LambdaQueryWrapper<>();
        //精准查询状态
        if (dto.getStatus() != null) {
            queryWrapper.eq(WmNews::getStatus, dto.getStatus());
        }
        //精准查询频道
        if (dto.getChannelId() != null) {
            queryWrapper.eq(WmNews::getChannelId, dto.getChannelId());
        }
        //关键字模糊查询
        if (dto.getKeyword() != null) {
            queryWrapper.like(WmNews::getTitle, dto.getKeyword());
        }
        //时间区间查询
        if (dto.getBeginPubDate() != null && dto.getEndPubDate() != null) {
            queryWrapper.between(WmNews::getPublishTime, dto.getBeginPubDate(), dto.getEndPubDate());
        }
        //查询用户id
        queryWrapper.eq(WmNews::getUserId, user.getId());
        //排序
        queryWrapper.orderByDesc(WmNews::getCreatedTime);

        //分页查询
        Page<WmNews> wmNewsPage = new Page<>();
        wmNewsPage.setCurrent(dto.getPage());
        wmNewsPage.setSize(dto.getSize());
        wmNewsPage = page(wmNewsPage, queryWrapper);

        //组装结果
        PageResponseResult result = new PageResponseResult(dto.getPage(), dto.getSize(), (int) wmNewsPage.getTotal());

        return result.ok(wmNewsPage.getRecords());
    }

    /**
     * 发布修改文章或保存为草稿
     *
     * @param dto
     * @return
     */
    @Override
    @Transactional
    public ResponseResult submitNews(WmNewsDto dto, WmUser wmUser) {

        //0.条件判断
        if (dto == null || dto.getContent() == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        //1.保存或修改文章

        WmNews wmNews = new WmNews();
        //属性拷贝 属性名词和类型相同才能拷贝
        BeanUtils.copyProperties(dto, wmNews);
        //封面图片  list---> string
        if (dto.getImages() != null && dto.getImages().size() > 0) {
            String imageStr = String.join(",", dto.getImages());
            wmNews.setImages(imageStr);
        }
        //如果当前封面类型为自动 -1
        if (dto.getType().equals(WemediaConstants.WM_NEWS_TYPE_AUTO)) {
            wmNews.setType(null);
        }

        saveOrUpdateWmNews(wmNews, wmUser);

        //2.判断是否为草稿  如果为草稿结束当前方法
        if (dto.getStatus().equals(WmNews.Status.NORMAL.getCode())) {
            return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
        }

        //3.不是草稿，保存文章内容图片与素材的关系
        //获取到文章内容中的图片信息
        List<String> materials = ectractUrlInfo(dto.getContent());
        saveRelativeInfoForContent(materials, wmNews.getId());

        //4.不是草稿，保存文章封面图片与素材的关系，如果当前布局是自动，需要匹配封面图片
        saveRelativeInfoForCover(dto, wmNews, materials);

        //5.审核文章
//        wmNewsAutoScanService.autoScanWmNews(wmNews.getId());
        // 这里我们集成定时任务模块
        // 远程调用添加任务
        wmNewsTaskService.addNewsToTask(wmNews.getId(), wmNews.getPublishTime());

        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);

    }

    /**
     * 根据id查询文章
     * @param newsId
     * @param wmUser
     * @return
     */
    @Override
    public ResponseResult findOne(Integer newsId, WmUser wmUser) {
        //参数校验
        if (newsId == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        if (wmUser == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
        }
        WmNews wmNews = wmNewsMapper.selectOne(Wrappers.lambdaQuery(WmNews.class).eq(WmNews::getId, newsId).eq(WmNews::getUserId, wmUser.getId()));
        if (wmNews == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST);
        }
        return ResponseResult.okResult(wmNews);
    }

    /**
     * 删除文章
     *
     * @param newsId
     * @param wmUser
     * @return
     */
    @Override
    @Transactional
    public ResponseResult delNews(Integer newsId, WmUser wmUser) {
        if (newsId == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        if (wmUser == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
        }
        //查询文章是否存在
        WmNews wmNews = wmNewsMapper.selectOne(Wrappers.lambdaQuery(WmNews.class).eq(WmNews::getId, newsId).eq(WmNews::getUserId, wmUser.getId()));
        if (wmNews == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST);
        }
        //删除文章
        int i = wmNewsMapper.deleteById(wmNews);
        if (i <= 0) {
            return ResponseResult.errorResult(AppHttpCodeEnum.SERVER_ERROR, "删除失败");
        }
        //删除文章图片与素材的关系
        int delete = wmNewsAndMaterialMapper.delete(Wrappers.<WmNewsMaterial>lambdaQuery().eq(WmNewsMaterial::getNewsId, wmNews.getId()));
        if (delete <= 0) {
            return ResponseResult.errorResult(AppHttpCodeEnum.SERVER_ERROR, "删除失败");
        }
        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }

    /**
     * 上下架文章
     *
     * @param dto
     * @return
     */
    @Override
    public ResponseResult downOrUp(WmNewsDto dto) {
        // 校验参数
        if (dto == null || dto.getId() == null || dto.getEnable() == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        // 查询文章是否存在
        WmNews wmNews = wmNewsMapper.selectById(dto.getId());
        if (wmNews == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST);
        }
        // 判断文章是否已发布
        if (!wmNews.getStatus().equals(WmNews.Status.PUBLISHED.getCode())) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID, "当前文章未发布，不能修改状态");
        }
        // 修改文章状态
        Short enable = dto.getEnable();
        if (enable < 0 || enable > 1) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID, "参数有误");
        }
        wmNews.setEnable(enable);
        wmNewsMapper.updateById(wmNews);

        // 发送消息 TODO
        if (wmNews.getArticleId() == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID, "文章id不存在，检测是否发布成功");
        }
        Map<String, Object> map = new HashMap<>();
        map.put("articleId", wmNews.getArticleId());
        map.put("enable", enable);
        kafkaTemplate.send(WmNewsMessageConstants.WM_NEWS_UP_OR_DOWN_TOPIC, JSON.toJSONString(map));

        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }

    /**
     * 第一个功能：如果当前封面类型为自动，则设置封面类型的数据
     * 匹配规则：
     * 1，如果内容图片大于等于1，小于3  单图  type 1
     * 2，如果内容图片大于等于3  多图  type 3
     * 3，如果内容没有图片，无图  type 0
     * <p>
     * 第二个功能：保存封面图片与素材的关系
     *
     * @param dto
     * @param wmNews
     * @param materials
     */
    private void saveRelativeInfoForCover(WmNewsDto dto, WmNews wmNews, List<String> materials) {

        List<String> images = dto.getImages();

        //如果当前封面类型为自动，则设置封面类型的数据
        if (dto.getType().equals(WemediaConstants.WM_NEWS_TYPE_AUTO)) {
            //多图
            if (materials.size() >= 3) {
                wmNews.setType(WemediaConstants.WM_NEWS_MANY_IMAGE);
                images = materials.stream().limit(3).collect(Collectors.toList());
            } else if (materials.size() >= 1 && materials.size() < 3) {
                //单图
                wmNews.setType(WemediaConstants.WM_NEWS_SINGLE_IMAGE);
                images = materials.stream().limit(1).collect(Collectors.toList());
            } else {
                //无图
                wmNews.setType(WemediaConstants.WM_NEWS_NONE_IMAGE);
            }

            //修改文章
            if (images != null && images.size() > 0) {
                wmNews.setImages(String.join(",", images));
            }
            updateById(wmNews);
        }
        if (images != null && images.size() > 0) {
            saveRelativeInfo(images, wmNews.getId(), WemediaConstants.WM_COVER_REFERENCE);
        }

    }


    /**
     * 处理文章内容图片与素材的关系
     *
     * @param materials
     * @param newsId
     */
    private void saveRelativeInfoForContent(List<String> materials, Integer newsId) {
        saveRelativeInfo(materials, newsId, WemediaConstants.WM_CONTENT_REFERENCE);
    }


    /**
     * 保存文章图片与素材的关系到数据库中
     *
     * @param materials
     * @param newsId
     * @param type
     */
    private void saveRelativeInfo(List<String> materials, Integer newsId, Short type) {
        if (materials != null && !materials.isEmpty()) {
            //通过图片的url查询素材的id
            List<WmMaterial> dbMaterials = wmMaterialMapper.selectList(Wrappers.<WmMaterial>lambdaQuery().in(WmMaterial::getUrl, materials));

            //判断素材是否有效
            if (dbMaterials == null || dbMaterials.size() == 0) {
                //手动抛出异常   第一个功能：能够提示调用者素材失效了，第二个功能，进行数据的回滚
                throw new CustomException(AppHttpCodeEnum.MATERIASL_REFERENCE_FAIL);
            }

            if (materials.size() != dbMaterials.size()) {
                throw new CustomException(AppHttpCodeEnum.MATERIASL_REFERENCE_FAIL);
            }

            List<Integer> idList = dbMaterials.stream().map(WmMaterial::getId).collect(Collectors.toList());

            //批量保存
            wmNewsAndMaterialMapper.saveRelations(idList, newsId, type);
        }

    }


    /**
     * 提取文章内容中的图片信息
     *
     * @param content
     * @return
     */
    private List<String> ectractUrlInfo(String content) {
        List<String> materials = new ArrayList<>();

        List<Map> maps = JSON.parseArray(content, Map.class);
        for (Map map : maps) {
            if (map.get("type").equals("image")) {
                String imgUrl = (String) map.get("value");
                materials.add(imgUrl);
            }
        }

        return materials;
    }


    /**
     * 保存或修改文章
     *
     * @param wmNews
     */
    private void saveOrUpdateWmNews(WmNews wmNews, WmUser wmUser) {
        //补全属性
        wmNews.setUserId(wmUser.getId());
        wmNews.setCreatedTime(new Date());
        wmNews.setSubmitedTime(new Date());
        wmNews.setEnable((short) 1);//默认上架

        if (wmNews.getId() == null) {
            //保存
            save(wmNews);
        } else {
            //修改
            //删除文章图片与素材的关系
            wmNewsAndMaterialMapper.delete(Wrappers.<WmNewsMaterial>lambdaQuery().eq(WmNewsMaterial::getNewsId, wmNews.getId()));
            updateById(wmNews);
        }

    }
}